diffusers/pr_12595/en/api/models/chroma_transformer.md

ChromaTransformer2DModel

A modified flux Transformer model from Chroma

ChromaTransformer2DModel[[diffusers.ChromaTransformer2DModel]]

class diffusers.ChromaTransformer2DModeldiffusers.ChromaTransformer2DModelhttps://github.com/huggingface/diffusers/blob/vr_12595/src/diffusers/models/transformers/transformer_chroma.py#L370[{"name": "patch_size", "val": ": int = 1"}, {"name": "in_channels", "val": ": int = 64"}, {"name": "out_channels", "val": ": typing.Optional[int] = None"}, {"name": "num_layers", "val": ": int = 19"}, {"name": "num_single_layers", "val": ": int = 38"}, {"name": "attention_head_dim", "val": ": int = 128"}, {"name": "num_attention_heads", "val": ": int = 24"}, {"name": "joint_attention_dim", "val": ": int = 4096"}, {"name": "axes_dims_rope", "val": ": typing.Tuple[int, ...] = (16, 56, 56)"}, {"name": "approximator_num_channels", "val": ": int = 64"}, {"name": "approximator_hidden_dim", "val": ": int = 5120"}, {"name": "approximator_layers", "val": ": int = 5"}]- patch_size (int, defaults to 1) -- Patch size to turn the input data into small patches.

• in_channels (int, defaults to 64) -- The number of channels in the input.
• out_channels (int, optional, defaults to None) -- The number of channels in the output. If not specified, it defaults to in_channels.
• num_layers (int, defaults to 19) -- The number of layers of dual stream DiT blocks to use.
• num_single_layers (int, defaults to 38) -- The number of layers of single stream DiT blocks to use.
• attention_head_dim (int, defaults to 128) -- The number of dimensions to use for each attention head.
• num_attention_heads (int, defaults to 24) -- The number of attention heads to use.
• joint_attention_dim (int, defaults to 4096) -- The number of dimensions to use for the joint attention (embedding/channel dimension of encoder_hidden_states).
• axes_dims_rope (Tuple[int], defaults to (16, 56, 56)) -- The dimensions to use for the rotary positional embeddings.0

The Transformer model introduced in Flux, modified for Chroma.

Reference: https://huggingface.co/lodestones/Chroma1-HD

forwarddiffusers.ChromaTransformer2DModel.forwardhttps://github.com/huggingface/diffusers/blob/vr_12595/src/diffusers/models/transformers/transformer_chroma.py#L476[{"name": "hidden_states", "val": ": Tensor"}, {"name": "encoder_hidden_states", "val": ": Tensor = None"}, {"name": "timestep", "val": ": LongTensor = None"}, {"name": "img_ids", "val": ": Tensor = None"}, {"name": "txt_ids", "val": ": Tensor = None"}, {"name": "attention_mask", "val": ": Tensor = None"}, {"name": "joint_attention_kwargs", "val": ": typing.Optional[typing.Dict[str, typing.Any]] = None"}, {"name": "controlnet_block_samples", "val": " = None"}, {"name": "controlnet_single_block_samples", "val": " = None"}, {"name": "return_dict", "val": ": bool = True"}, {"name": "controlnet_blocks_repeat", "val": ": bool = False"}]- hidden_states (torch.Tensor of shape (batch_size, image_sequence_length, in_channels)) -- Input hidden_states.

• encoder_hidden_states (torch.Tensor of shape (batch_size, text_sequence_length, joint_attention_dim)) -- Conditional embeddings (embeddings computed from the input conditions such as prompts) to use.
• timestep ( torch.LongTensor) -- Used to indicate denoising step.
• block_controlnet_hidden_states -- (list of torch.Tensor): A list of tensors that if specified are added to the residuals of transformer blocks.
• joint_attention_kwargs (dict, optional) -- A kwargs dictionary that if specified is passed along to the AttentionProcessor as defined under self.processor in diffusers.models.attention_processor.
• return_dict (bool, optional, defaults to True) -- Whether or not to return a ~models.transformer_2d.Transformer2DModelOutput instead of a plain tuple.0If return_dict is True, an ~models.transformer_2d.Transformer2DModelOutput is returned, otherwise a tuple where the first element is the sample tensor.

The FluxTransformer2DModel forward method.